Text and Data Mining valid from 2019-04-25
Received: 18 February 2019
Accepted: 9 April 2019
First Online: 25 April 2019
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: The regional committee for medical and health-related research ethics (REK 2012/1944) and the data protection manager at Ahus have approved the study. Written informed consent was obtained from all participants.